================
@@ -177,6 +185,11 @@ def CoyieldExpr : StmtNode<CoroutineSuspendExpr>;
 def ConceptSpecializationExpr : StmtNode<Expr>;
 def RequiresExpr : StmtNode<Expr>;
 
+// C++26 Expansion statement support expressions
+def CXXExpansionInitListExpr : StmtNode<Expr>;
+def CXXExpansionInitListSelectExpr : StmtNode<Expr>;
+def CXXDestructuringExpansionSelectExpr : StmtNode<Expr>;
----------------
Sirraide wrote:

> short of just storing the `CXXExpansionInitListExpr*`/`DecompositionDecl*` as 
> a `void*` and just adding a `bool IsExpansionInitList` member to it

I guess we could make it a 
`PointerIntPair<PointerUnion<CXXExpansionInitListExpr*, DecompositionDecl*>, 1>?

https://github.com/llvm/llvm-project/pull/165195
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